FTHELP

       Routine to print a description of a FITS ASCII table extension

       FTHELP, H, [ TEXTOUT = ]

       H - FITS header for ASCII table extension, string array

       TEXTOUT - scalar number (0-7) or string (file name) determining
               output device (see TEXTOPEN).  Default is TEXTOUT=1, output
               to the user's terminal

       FTHELP checks that the keyword XTENSION  equals 'TABLE' in the FITS
               header.

       Uses the non-standard system variables !TEXTOUT and !TEXTUNIT
       which must be defined (e.g. with ASTROLIB) prior to compilation.

       REMCHAR, SXPAR(), TEXTOPEN, TEXTCLOSE, ZPARCHECK

       version 1  W. Landsman  Jan. 1988
       Add TEXTOUT option, cleaner format  W. Landsman   September 1991
       TTYPE value can be longer than 8 chars,  W. Landsman  August 1995
       Converted to IDL V5.0   W. Landsman   September 1997
       Remove calls to !ERR, some vectorization  W. Landsman  February 2000

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